Roasting-furnace.



No. 654,335. Patented lu-ly 24,' |900.

Y U. WEDGE.

RQASTING FUBNAGE.

(Application led Mar. 13| 1899.)

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i-rTED u STATES' PATENT Orrin.

UTLEY WEDGE, or BAYONNE, NEW JERSEY.

.aoAsTiNc-FURNAQE.

SPECIFICATION forming part `of Letters Fatent No. 654,335, dated July24, 1900. Application filed March 13,1899. Serial No. 708,806. (Nomodel.)

To @Uu/homA it may concern: V

Be it known that I, UTLEY WEDGE, a citizon of the United States,residing at Bayonne, in the county of Hudson nand State of New Jersey,have invented certain new and useful Improvements in Roasting-Furnaces;and I do hereby declare the following' to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use thel same.

My invention relates to improvements in furnaces for roasting,calcining,oxidizing,and like operations, the object being to improve theconstruction of the furnace and obtain better results in its operation;and the invention consists in the novel features of construction,combination, 4and arrangement of the various parts for coaction 'toproduce such results, all as hereinafter described, and set forth in theclaims. l

In the drawings, Figure 1 represents in cen tral vertical sectionafurnace in the construction of which my invention is embraced. Fig. 2represents a horizontal section through one of the furnace-chambers ofthe furnace shown in Fig. 1, the plane of section being indicated by thebroken linen: in Fig; l. Fig. 3 represents a central Vertical section ofa furnace embracing certain 4modifications of construction. Fig. 4 is ahorizontal section through the furnace shown in Fig. 3,`taken en theplane indicated by the broken line y y on Fig. 3. Fig. 5 is a horizontalsection 4through the furnace shown in Fig. l, taken on the planeindicated by the broken line w won Fig. l; and Fig. 6 is a like sectionthrough vthe furnace shown in Fig. 3, taken on the broken line a e' onFig. Fig. 7 is a horizontal section on the same plane as Fig. 5, butillustrating a modified construction wherein the passages from oneroasting-chamber to the next are carried outside of thefurnace-chambers. Fig. 8 is a vertical sectional detailon the planeindicated by the broken line n fu on Fig. 7, illustrating more clearlythe construction shown in Fig. 7. Fig. 9 is a sectional detail throughone of the passages g, taken on line u u of Fig. 2; and Fig. l0 is adetail showing more clearly the connection of the stirring-arms to 5othe shaft and the arrangement of the stirringblades.

The furnace is constructed with chambers in a tier one above the other,forming what is nace, andl is provided with a central vertical shaftcarrying horizontal stirring-arms in the several roasting-chambers, bythe rotation of which the material under treatment is continuouslystirred and moved so as to pass from 6o chamber to chamber until it isfinished and discharged. i

My improved furnace is adapted to such o'perations as drying,desulfurizing,chloridizing, oxidizing, roasting, or calcining ores,mattes, metallic bodies, orcom pou nds, oxids or other crushed, ground,or comminuted materials; but for convenience I shall describe theoperation' of roating ores or sulds-such, for instance, as pyritesiines-it being under-v 7o stood thatwherever I use the term roastingsuch operations as chloridizing,oxidizin g,dry ing, tc., are alsoincluded.

The furnace comprises the tower-like structure A, of` brick or othersuitable refractory material, `divided into roasting-chambers a a2 CL3,dac., as many as are required. A central vertical shaft B is provided ineach' of the chambers a 0,2 a3, dro., with oneyor more arms h, carryingstirring-blades b2, which ext-end so 8o near the floor of the chamber asto just have sufficient clearance and are set at such an angle to thearm which carries them as to pass the material on the floor outward orinward toward the passage into the next lower roasting-chamber, as'seenin Figs. 5 and 6, where the inclination of the blades b2 is indicated bythe dotted lines on the arms l). The arms b are preferably attached tothe shaft B by to flanges b4, formed on short lateral branches b of theshaft B, as best seen in Fig. lO.

In some roasting operations the material itself has not sufficientcombustible constituents to effect its own` roasting, and in such casesit is necessary to supply some heat additional to that generated bytheroasting ore itself. This has been done by arranging furcommonlycalled a tower7 or turret fur- 55 being bolted through flanges b3 on thearm b 9o i naces in connection with the roasting chambers and burningfuel in such furnaces, the combustion-gases from the furnaces passinginto and through the roasting-chambers and commingling with the gasesgiven off by the `roasting material. In many cases, however, thismingling of combustion-gases with the gases from the roasting materialis very deleterious and even fatal to the operation. It' the 1osulfurous gases from sulid ores are to be used in manufacturing sulfuricacid or sulfates,

the presence of the carbonaceous combustiongases is extremelyobjectionable, while in many operations-such as-the dead-roasting I5 ofores, &c.the presence of such carbona- Ceous gases in the roasting oroxidizing charnber atthe high temperature employed exerts a reducingeffect upon the material and very seriously interferes with theoperation and zo also impairs the quality of the product. A furtherobjection to `such mingling of the gases in the roasting-chambers isthatin many cases the material contains more or less dust,which is ofvalue, and the increased volume of gases z 5 passing through theroasting-chambers carries out more of this dust than would otherwise betaken up, and some portion of the dust so carried out is not recoveredin the dust-chamber, but is lost.

Tosupply the heat necessary to supplement that generated by thecombustion of the material itself or to supply the heat required whenthe material is not itself combustible, I interpose between theroasting-chambers one or more furnace-chambers, preferably alternatingthe furnace-chambers c c2, &c., with the roasting-chambers ct d2 d3,&.c., as shown in Figs. l and 3. The furnace-chambers may be more orless in number than the roastingchambers, and two, three, or v more ofthe roasting-chambers may intervene between the furnace-chambers, as thenature of the material treated may require; butfor most purposes thealternate arrangement shown is to be preferred. The furnace chambers areheated by any preferred means-as furnaces C, oil-burners d CZ, orgas-burners e-as I do not limit myself to any specific mode of heating.The combustion-gases from one furnace-chamber are preferably passed by afl ue, as c6, to the next furnace-chamber, thus further' utilizing theheat of the combustiongases, and from the last furnace-chamber thecombustion-gases pass, as by flue '05, to the 5 5 stack f. In any casethe gases may be passed to any device, as a boiler or feed-water heater,for utilizing their waste heat instead of passing them to the stack.

The shaft B is protected where it passes through the furnace-chambers bya wall c7, of masonry, built around it, and a wall cs, of masonry,incloses the passages g g2, through which the material is passed fromone roasting-chamber to the next, as seen in Figs. 1,

2, and 4, or the passages g may be formed in the outer wall of thefurnace A without passing through the intervening furnace-charnber, asshown at g3 in Figs. 7 and'S.

The material to be treated is fed by any su itable feeding device-such,for instance, as the 7o hopper B and conveyer h-into the upperroasting-chamber through an inlet t', and from thelower chamber anoutlet j delivers the finished product into cars lo or into bins orother desired receptacle; From the upper chamber a gas-flue Z conductsthe gases thrown oif from the material to any desired place ofdisposition, such as acid-chambers, dust-chambers, &c.

By the construction I have shown and de- 8o scribed it will be seen thatn-one of the-combustion-gases are allowed to enter theroasting-chambers, but each kind of gases isv kept separate andseparately utilized and disposed of. between two of, theroasting-chambers heats both of the latter chambers by the sam-eexpenditure of fuel which would be required. to heat one only, and thiseffect is increased by utilizing in the upper chambers the waste 9o heatof the gases from the lower chambers.

The shaft B, which may be of any usual or suitable construction, issupported at the bottom, as by the step n, and is rotated by anysuitable means-such, for instance, as the 95 gear m and driven gear m2.Doors d afford access to the various chambers for any desiredpurpose-such as inspection, sampling, adding reagents, or makingrepairs-and through these doors air can be admitted, if roo desired, atany point and in any quantity required, or the air can be entirelyexcluded,-if the particular operation may require. The gases given offby the material pass up from chamber to chamber through the passages gg2 and out of iiue Z, the course of the gases being indicated by lightarrows. The course of the combustion-gases is in like manner indicatedby heavy arrows.

p represents a damper in the stack f for 11o controlling the combustionproducts and regulating the draft and heat in the furnacechambers, asmay be required.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a roasting-furnace the combination of a tier ofroasting-chambe1's,.furnace-chambers interposed in the series ofroasting-chambers and not communicating therewith, but so communicatingwith each other that the com- 12o bustion products of onefurnace-chamber are conducted into another, passages connecting theroasting-chambers with each other, whereby the material'in theroasting-chambers may be passed from chamber to chamber out of 125contact with any gases other than those generated therein, and stirringmechanism in each roasting-chamber, substantially as described.

2. In a turret-furnace the combination of 13ov The interposin g of thefurnace-chambers 85 oom munioating with the intervening fnrnaee- 1ochamber, and means for rotating said shaft, substantially as described.

In testimony whereof I hereto affix my signature in presence of twoWitnesses.

UTLEY WEIDGE.

VvTitnesses:

CHAS. E. ANNETT, M. P. STRINGHAM.

